3D Modelling, 3D Printing Magnetic Leatherman Surge bit holder May 8, 2022 I got tired of the Leatherman bits, and decided to design a suitable holder for standard sized bits. Requires 8x 6mm wide and 3mm thick magnets. Good fit on the side strap. Not too much stickout on either end. The bits are visible through the opening. Good match with the bit extension. It uses “standard” sized magnets for 3D models. 3D model.