For routing the groove for intumescent strips in a frame or door. Fast and accurate method of fitting to ensure the perfect fit to meet fire regulations. PTFE coating on the body helps reduce resin, friction and subsequent heat build-up in use to increase cutter lifespan. Position of groove can be altered with the router plunge. ¼" shank for easy control in smaller routers, with K mark to ensure safe working practices Suitable for Cutting Softwood, Hardwood, Laminate, Veneer Wood, Plywood, Chipboard, Fibreboard & Sandwich Material 1/4" Straight Shank Tungsten Carbide-Tipped Anti-Kickback Design Double-Flute PTFE Coating to Minimise Heat & Resin Build-Up K Mark Shank Suitable for Cutting Softwood, Hardwood, Laminate, Veneer Wood, Plywood, Chipboard, Fibreboard & Sandwich Material 1/4" Straight Shank Tungsten Carbide-Tipped Anti-Kickback Design Double-Flute PTFE Coating to Minimise Heat & Resin Build-Up K Mark Shank