Klein Tools Square Set 93547SQVP 4 1 2 Inch Trim and 7 In Rafter Aluminum Layout Scribe (0 To 90 Deg Dual Reference Base Laser Etched Markings) Forstner Bits Massive 1 1 2 Inch Cutting Diameter: Maximizes Massive 1 1 2 Inch Cutting Diameter: Maximizes surface coverage per pass to accelerate wide slab leveling and spoilboard planing routines this specialized groover forms a 1 1 4 inch wide by 1 inch deep stress relief groove with a 1 2 inch edge radius to satisfy commercial paving codes and prevent slab cracking under heavy traffic loads Complete 2 Piece Carpentry Set: Combines a compact 4 1 2" trim square and a standard 7" rafter square to cover fine finish and structural layout needs roof framing