I had to return my BLACK+DECKER 20V MAX 3/8" cordless drill (LDX120C) because the drill chuck would not close onto the bits. This one, on the other hand, has a very good locking mechanism that works great by hand There is actually a 'click' when it snaps onto the bit so you don't have to worry about it coming loose.(Weeks past the return period) Now I'm so happy with this new drill bit!I can use them HIGHLY recommend for the price!