HEAVY DUTY 5/8" (16mm) Magnetic Drill Chuck with 3/4" Weldon Shank Adapter 5/8" Heavy Duty Chuck for Magnetic Drill Press 3/4" Weldon Shank adapter (The jacobs taper end press fits into the chuck, opposite end is 3/4" weldon shank) Please confirm your drill is compatible with a 3/4" Weldon Shank Comes With Chuck Key and adapter