2L, Snap Back, Hole Saw Arbor, Quick Change, Drive Off Pins, Not Threads To Prevent The Threads From Stripping, Prevents Hole Saw Locking On Arbor, No Adaptor Required, Arbor Threads Directly Onto Hole Saw, No Tools Needed, Fits 20L-96L or 1-1/4" To 6" Hole Saws, For 1/2" Or Larger Hex Shank.