Spyder Stinger 14 Piece Assorted Woodboring Spade Drill Bit Set Lotion Dispensers Job Ready Pack: 15 blades '203979022 Job Ready Pack: 15 blades Adjustable Latch & Backset: Fits standard door preps with 2 3 8" to 2 3 4" backset and 1 3 8" to 1 3 4" door thickness 20x faster than conventional spade bits 10x more holes than conventional spade bits Spyder stinger(TM) automatically engages the work surface for no thrust drilling Unlike other spade bits with a self feeding thread point the Spyder stinger(TM) thread point won't clog and it won't wander making you more productive Impact rated for use in battery powered impacting tools 1 4 In speed hex won't slip in the chuck and fits quick change impact drivers Black oxide finish provides increased durability and lubricity 14pc kit contains: 1 4