Champion Step Reamers XSR-5/16-9/16 - 5 Sizes - 5/16; 3/8; 7/16; 1/2; 9/1 Enlarge; Align & Drill Holes In Steel Up to 1/2” Thick Engineered For Heavy Duty Applications Safety Collar Prevents Overpenetration Fast Cutting. Long Tool Life. Bur-Free Holes 90 degree Drill Point Clearly Marked Sizes Sharp 2 Flute Design Safety Collar Stop 3/8" Flatted ShankPopular Industry Applications Steel Fabrication: Structural Steel & Beam Fabrication; Bridge Erection Construction: Commercial; Infrastructure Industrial: Aerospace; Automotive; Water Utilities; Energy; Oil & Gas; Mining MRO: Truck & Trailer; Automotive; Municipalities; Farm Equipment; Elevator MEP: HVAC; Electrical Systems; Plumbing Champion XSR Step Reamer Bit (5/16" - 9/16") XSR-5/16x9/16