Patented thin wall design cuts 3X faster than any other brandsThe cutting difference Century diamond grit hole saws run cooler with less pressure for an accurate holeProven test results Century’s diamond grit hole saws cut 4X the holes of other diamond grit hole saw brands
Use 2-1/8-inch diameter hole for lever & 1-inch diameter hole for latch bolt
Fire finish provides a highly pleasing appearance
Universal adjustable flange and nipple
Excess flow valve
Passage Lock, Ball Knob, Satin Stainless Steel, 2.75-In. Backset Rotary Tool Accessories Patented thin wall design cutsSatin stainless steel finish, passage ball knob lock, commercial grade 2, 400,000 cycles, cylindrical, 2 3 4" backset, t strike, ul listed, 1 year limited warranty.