BLAIRReplacement Pilots for Blaircutter Arbor1 Pk (3 Each) - Part#13217When you dont have a lot of holes to make economical 13000-Series" Blaircutters"! provide fast accurate burr-free holes in materials up to 3/16" thick. Lightduty Blaircutters are annular cutting tools that cut around the edge of the hole and eject the center as a slug. Because theyre hollow theres no dead zone as with twist drills. And unlike hole saws that rip and tear through the material they quickly give you a quality virtually burr-free hole. Blaircutters are available in seven sizes for 1/4" and larger drill chucks. Spring loaded pilot "pops" the slug from the cutter.