All bits appear to have the same 1/4" hex base. Power bits (longer bits) and short regular bits. For use with the extension cords included in this set. This is Makita's response when I called them This is not on the packaging, product description or the paper insert if one comes with your kit This is a design issue, where the C-ring is 2mm higher in the extension, and when you insert the power bits, the 1/4" hex base will go through the C-ring and lock the bit in place. When inserting regular (short) bits into the extension, the C-ring presses against the body of the 1/4" hex base, holding the bit in place. Take a close look at the base of the two types of bits in this set. "hex, BUT the arm on the power bits is shorter than normal bits, which solves this serious problem when rendering your kits. c. Please contact Makita to complain about this and also file online a complaint You need to fix this Design flaw.
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