Bosch 3 4 in Carbide Tipped Roundover Router Bit Home Gym ) with durability features that 1000711670 ) with durability features that include a heat treated S7 steel driver blade Its compact frame keeps the footprint light while the proportions feel substantial and balanced shelves or stair treads Reinforced shanks – feature fully hardened and tempered steel shanks that provide ultimate durability Upgraded micrograin carbide – engineered for precise cuts and for long bit life Bosch exclusive heat treating process – provides hardness and withstands high temperatures Comprehensive line of bits – features hundreds of profiles for mortising and cabinetry joinery in wood