Pic heavy review on my new Proto 450 series box 
200 lb capacity drawer slides with adjustable detents. The detents take some getting used to as there's a second set on drawer extension. The second set kicks when you get to the second stage slides but only if you closed the drawer past the first detent. If you don't push past the detent when you close the drawer the second set never clicks (Not noticeable if you have weight in the drawer anyway). Most of the time I leave about half my drawers unlatched so I can open the drawer, grab the tool I need, and close the drawer without ever stopping as I walk by the box.
Drawers open a bit stiff until you load them up (Top drawer is single finger open and closed with weight in it) but a shot of silicone spray in the slides helps the lighter drawers roll a little easier. Single slides on all the drawers but they are pre-cut for extra slides if one wanted to add slides to the top extra wide and bottom wide drawer. Looks like one could reconfigure the drawer layout also as the box is punched for slides all the way up.
Drawers are 16 ga steel and have rolled lips. Feel quite steady with weight in them. Drawer liners are pre-cut and top notch
The top mat is thin but very heavy and lays flat. Wipes off with a rag too.
Box shell
The handle bolts on either side and feels sturdy.
Casters roll almost too easily and are very quiet. Lock the wheels before you walk away or your box may exit stage left...
The frame is 14 ga and looks like you could add a third set of casters.
Overall quite happy with the box for $2800. Only problem I had was a slide on one of the drawers wasn't fully seated so the drawer didn't want to close right until I pulled it out and looked at it. Reached behind the drawer and clicked the second stage of the slide in and all is well
I actually quite like the drawer pulls also. Wasn't sure I would but they're sweet...

200 lb capacity drawer slides with adjustable detents. The detents take some getting used to as there's a second set on drawer extension. The second set kicks when you get to the second stage slides but only if you closed the drawer past the first detent. If you don't push past the detent when you close the drawer the second set never clicks (Not noticeable if you have weight in the drawer anyway). Most of the time I leave about half my drawers unlatched so I can open the drawer, grab the tool I need, and close the drawer without ever stopping as I walk by the box.
Drawers open a bit stiff until you load them up (Top drawer is single finger open and closed with weight in it) but a shot of silicone spray in the slides helps the lighter drawers roll a little easier. Single slides on all the drawers but they are pre-cut for extra slides if one wanted to add slides to the top extra wide and bottom wide drawer. Looks like one could reconfigure the drawer layout also as the box is punched for slides all the way up.
Drawers are 16 ga steel and have rolled lips. Feel quite steady with weight in them. Drawer liners are pre-cut and top notch
The top mat is thin but very heavy and lays flat. Wipes off with a rag too.
Box shell

The handle bolts on either side and feels sturdy.
Casters roll almost too easily and are very quiet. Lock the wheels before you walk away or your box may exit stage left...
The frame is 14 ga and looks like you could add a third set of casters.
Overall quite happy with the box for $2800. Only problem I had was a slide on one of the drawers wasn't fully seated so the drawer didn't want to close right until I pulled it out and looked at it. Reached behind the drawer and clicked the second stage of the slide in and all is well
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