Nifty mail box delivery this morning, a funny looking drill bit.
It’s a pocket hole drill bit with collet for depth adjustment used to join two pieces of timber by drilling into one at a angle to the right depth (collet) and then driving a screw through into the other timber.
Ideally you would use it in conjunction with a pocket hole jig to ensure the correct angle but they are expensive so I’ll have a go at making one.
