1.size:3/8"(10mm),1/2"(13mm),5/8"(16mm) 2.keyless,key type drill chuck 3.light,heavy duty ... 4.packing:color box,blister(2,3ps) Applicable ... precision taper thread and hole.2. Adopt unique thrust bearing, easy to put the key input force into larger ... is accurate, reliable and durable.Packing:Bulk,2 and 3 sets blister packwelcome purchase