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regular hex bits small 4mm bits

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3d printed mount It will allow you to Hold 99 drill bits per case. That is a total is 396 bits after installing 4 of these (1 row). The fitting is designed in a way that bits will stay in place but not hard enough for them to be difficult to pull out They will fit the box tight (use fingers to install but use pliers to remove) Tough case is not part of this listing. Just the 3d printed item Pictures taken with box DT70804-QZ Edit: I added a variation for small 4mm hex bits. They fit right next to each other. That variation is 1/4 of a row and it fits 17 x 15 so 255 bits