HSS Spiral Grooved Step Drill 1/4~1-3/8&quot;<br /><br />Features :<br />No need for a pilot hole<br />Titanium coated to reduce friction and run cooler<br />High speed steel，durable.<br />HSS Drill Bit Set For Wood， Plastic and Aluminum， Copper， Steel.<br />Ideal For DIY， Home and General Building/Engineering Using.<br /><br />Specification :<br />Color : Gold(as picture shown)<br />Material : High Speed Steel<br />Surface : Nitrogen treatment (increasing the hardness and abrasion resistance)<br />Shank:Triangle round handle<br />Scop : thin iron plate，aluminum，insulation panels，PVC panels 4mm thickness within the timber.<br />Model:1/4~1-3/8&quot;(1/4， 3/8， 1/2， 5/8， 3/4， 7/8， 1， 1-1/8， 1-1/4， 1-3/8&quot;)<br />Shank Size:25 x 10mm<br />Total Height: 80mm<br /><br />Package included :<br />1 x 1/4~1-3/8&quot; HSS Drill