Our company is a specialty manufacturer of metal cutting tools and woodworking cutting tools. Our products 100% exported, we have promoted our products in USA, Canada, Europe, Australia, south-east Asia, Taiwan and so on with good reputation. We company sell as follows step drills: Spiral Grooved HSS STEP DRILL Straight Grooved HSS STEP DRILL Shank: Round shank; Hex shank; Three flat shank 1) 45 degree & 90 degree hss step drill bits 2) Inch several size hss step drills: 3/16 - 1/2 x 6 step 1/8 - 1/2 x 13 step 1/4 - 3/4 x 9 step 3/16 - 7/8 x 12 step 7/16 - 1-1/8 x 12 step 1/4 - 1-1/2 x 11 step 1/2 - 1 x 9 step 9/16 - 1 x 8 step 3/4 - 1-3/8 x 11 step 13/16 - 1-3/8 x 10 step Metric several size hss step drills: 4 - 12mm x 5 step 4 - 12mm x 9 step 4 - 20mm x 9 step 4 - 22mm x 10 step 4 - 30mm x 14 step 4 - 39mm x 14 step 5 - 35mm x 13 step 6 - 18mm x 7 step 6 - 20mm x 8 step 6 - 24mm x 10 step 6 - 30mm x 13 step 6 - 32mm x 8 step 14 - 24mm x 6 step 14 - 25mm x 7 step 20 - 34mm x 8 step 10 - 20mm x 11 step 20 - 30mm x 11 step 3) hss step drill sets: Inch size 3 pcs sets in wooden box or set in blister card or set in aluminium box. 3/16 - 1/2 x 6 step 1/8 - 1/2 x 13 step 1/4 - 3/4 x 9 step Metric size 3 pcs sets in metal box or set in wooden box or set in blister card or set in aluminium box. 4 - 12mm x 9 step 4 - 20mm x 9 step 4 - 30mm x 14 step x 3 pcs/set 4 - 12mm x 9 step 6 - 20mm x 8 step 6 - 30mm x 13 step x 3 pcs/set If you have interest in our products please Visit our website: and contact me. We will supply you with high quality products and best price and service.