Kreg, Pocket Hole Jig Expansion Pack, Expands The Capability Of Pocket Hole Jig 310 Or 320 By Adding Another Drill Guide To Drill More Holes, Plus A Spacer That Fits Between The Guides For More Hole Spacing Options, Includes 1 Hardened Steel Drill Guide With Thickness Stops For 1/2", 3/4", 1-1/2", Add A Second Guide To The Pocket Hole Jig 310, Or Add A Third To The Pocket Hole Jig 320, Kit Also Includes A Pocket Hole Jig Spacer That Provides More Pocket Hole Spacing Options By Positioning The Spacer Then Twisting The Drill Guides To Lock Them In, Lifetime Warranty.