ITEM NAME:4pcs 1/4" Shank Round Over Router Bits Corner Rounding Edge-Forming Edging Bits Description: Great for combined plunge-cutting and pattern/template routing. Tungsten car.Shank: 1/4". Suitable for cutting composition materials, plywoods, hardwoods, and softwoods. Radius: 1/2", 3/8", 1/4", 1/8". 1/8" R Total length: 2". 1/4" R Total length: 2-1/4". 3/8" R Total length: 2-3/8".