This spring loaded self-centering drill bit is perfect for precise easy drilling in hardware. The bevelled tip on these Vix-Bits align in the countersunk hole of the hardware & provide an accurate & precise center-drilled hole for the corresponding screws. The drill depth is also adjustable to a specific depth, due to the set-screw on the side of the Vix-Bit. The drill bits will work in a number of materials including wood, metal, & plastics. These self-centering bits are a most handy tool especially when working with hardware! Made by Adjustable Clamp Co. / Pony Jorgensen.