Trend Professional Router Cutter 53/30x1/4TC - Mortise Router Cutter / Morticer 12.7mm diameter x 50mm cut x 1/2" shank TCT (Tungsten Carbide Tipped) cutter with staggered cutting surfaces Key Features: Deep mortising and grooving giving good chip clearance For lock mortising, two width cuts will be needed to achieve the standard 19mm mortise Specification: D: 1/2 inch (imperial diameter) D: 12.7 mm (metric diameter) C: 50 mm (cut length) OL: 108 mm (overall length) Shank Diameter: 1/2 inch