What bit is this?
- Thread starter Wyoming09
- Start date
RoninB4
Well-known member
-Almost looks like a ball-lock design so it doesn't fall out of the chuck. The other end would be the function.
RTM
Well-known member
If the end you're showing is a three-sided bit I would tend to agree with Ronin. If 4 sided, maybe an uncut Phillips bit size 7. What brand is the railing, what came with it etc etc.?
Old Man Roger
Well-known member
For a rotary hammer drill.
KnurledNut
Well-known member
These are not SDS regardless of what Amazon says.
They are four-hollow square shank bits, designed to fit cheap chinese hammer drills.
SDS+ bits use a 10mm round shaft with slotted keyways that engage with the drive system in the tool. They can be complex to manufacture.
These chinese bits simply drive the square. Easier and cheaper to make the bits and the tool.
Best suited for the circular file.
They are four-hollow square shank bits, designed to fit cheap chinese hammer drills.
SDS+ bits use a 10mm round shaft with slotted keyways that engage with the drive system in the tool. They can be complex to manufacture.
These chinese bits simply drive the square. Easier and cheaper to make the bits and the tool.
Best suited for the circular file.
cherrybomb
Well-known member
If your drilling concrete for a pool railings, I would not skimp on the drill,bit or hole preparation,and quality of the fastener.
Dave455
Well-known member
I don’t know anything about pools (coming from a country where an outdoor pool is unusable for 11 months of the year
) but I usually find that fixings supplied with products are totally inadequate for the purpose.If you’re fixing into concrete, or concrete block, the best option is a Rawlbolt / concrete anchor. These are unbelievably strong provided you’re fixing it into something solid.
Other options are a “Tapcon”, that screws straight into concrete
Or a chemical anchor
Both of which work better than they look like they might.
If whatever you’re fixing has small holes, and you have to use screws, then use a decent wall plug.They all look similar but the quality varies enourmously.
If you have the space, some manufacturers (e.g. Fischer) offer extra long ones.
And use a coach screw / lag screw rather than a regular screw. Stronger and easier.
Finally, you will find that concrete, with gravel in the mix, can be very hard on drill bits. I’ve seen cheap ones wear out before making it to the bottom of one hole, so give yourself a fair chance and get something decent. Even good ones are not expensive.
If you are drilling into concrete, get a proper SDS drill. Even an inexpensive one will work waaay better than any other option.
I suspect that cherrybomb was suggesting that pool railings get leant on and hauled on, so you don’t want the fastenings failing. Same applies if you’re fitting a grab handle by a step, or in a shower for an elderly person.
Last edited:
Old Man Roger
Well-known member
Chlorine has to be considered too. It is very corrosive.I don’t know anything about pools (coming from a country where an outdoor pool is unusable for 11 months of the year
If you’re fixing into concrete, or concrete block, the best option is a Rawlbolt / concrete anchor. These are unbelievably strong provided you’re fixing it into something solid.
Other options are a “Tapcon”, that screws straight into concrete
Or a chemical anchor
Both of which work better than they look like they might.
If whatever you’re fixing has small holes, and you have to use screws, then use a decent wall plug.They all look similar but the quality varies enourmously.
If you have the space, some manufacturers (e.g. Fischer) offer extra long ones.
And use a coach screw / lag screw rather than a regular screw. Stronger and easier.
Finally, you will find that concrete, with gravel in the mix, can be very hard on drill bits. I’ve seen cheap ones wear out before making it to the bottom of one hole, so give yourself a fair chance and get something decent. Even good ones are not expensive.
If you are drilling into concrete, get a proper SDS drill. Even an inexpensive one will work waaay better than any other option.
I suspect that cherrybomb was suggesting that pool railings get leant on and hauled on, so you don’t want the fastenings failing. Same applies if you’re fitting a grab handle by a step, or in a shower for an elderly person.