Kreg Combo K4ms Jig Master System + Free Kreg Sk03 Pocket-hole Screw Kit Body Material: Glass-filled nylon Number of Drill Guides: (3) 3/8" (9mm) diameter standard Kreg pocket holes For Use with Materials from 1/2" to 11/2" thick (12-38mm) Drill Guide Spacings: 9/16", 7/8", 17/16" 14mm, 22mm, 36mm Warranty: Lifetime Kreg Drill Guide warranty