These Tools Vary In Size, Length, And Diameter. Send Us Your Request. Rock Augers - CORE BARRELS - Kelly Bar Adapters - Soil Augers - Mud Buckets - Digging Buckets Over 100 To Choose From! CORE BARRELS - Diameter(in) 12 12 12 28 38 62 62 62 62 66 68 Barrels W/ Hard Rod 12 22 28 30 36 48 54 56 56 62 62 Shot Barrels 30 34 36