Specially designed for use on reversible portable drills, SST power taps are guaranteed to tap faster and last longer than standard taps in steel, stainless steel and other ferrous or non-ferrous metals. SST power taps eliminate slow hand tapping to increase productivity and reduce overall tapping costs.Features: 3 flats to fit any drill chuck without slippage Long & resistant shank for tapping deep holes SST surface treatment to increase lubricity Special "Power Tip" ejects chips ahead of tap Special "Power Tip"self-aligns with hole axis Materials: Aluminum Mild steel Stainless steel Applications: Cutting threads with reversible portable drill Repairing damaged threads Tapping through holes Tips: Use Walter Tapcut lubricant for best results Use at slow speed to increase tap life Specifications: Part Tap Size Overall Length Drill Size Use Drill withCapacity in Steel of 03-A 561 6-32 NC 2-1/2 " #36 3/8 " 03-A 581 8-32 NC 2-13/16 " #29 3/8 " 03-A 601 10-24 NC 2-13/16 " #25 1/2 " 03-A 604 10-32 NF 2-13/16 " #21 1/2 " 03-A 621 12-24 NC 3-3/16 " #16 1/2 " 03-B 541 1/4"-20 NC 3-3/16 " #7 1/2 " 03-B 544 1/4"-28 NF 3-3/16 " #3 1/2 " 03-B 551 5/16"-18 NC 3-11/16 " F 1/2 " 03-B 554 5/16"-24 NF 3-11/16 " 17/64 1/2 " 03-B 561 3/8"-16 NC 4-3/32 " 44697 1/2 " 03-B 564 3/8"-24 NF 4-3/32 " 21/64 5/8 " 03-B 571 7/16"-14 NC 4-3/32 " U 5/8 " 03-B 581 1/2"-13 NC 4-5/16 " 27/64 5/8 " 03-B 584 1/2"-20 NF 4-5/16 " 29/64 5/8 " 03-B 594 9/16"-18 NF 4-5/16 " 33/64 5/8 " * All Pictures Shown Are For Illustration Purpose Only. Actual Product May Vary Due To Product Enhancement.