Champion Step Reamers 5 Drill Sizes • 1 Tool XSR-5/16-9/16 : 5/16; 3/8; 7/16; 1/2; 9/1 XSR-9/16-13/16 : 9/16; 5/8; 11/16; 3/4; 13/16 XSR-13/16-1-1/16 : 13/16; 7/8; 15/16; 1; 1-1/16• 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 3 Piece Bit Set (5/16" - 1-1/16") XSR-SET