30 Piece ROUTER BITS - 2 Cases of 15 - 1/2" Shank 1/4" Bits Tungsten Carbide Edges Precision ground 1/2" Shanks (15 Bits per case) Precision ground 1/4" Shanks (15 Bits per case) Super Sharp Tungsten Carbide edges that absorb heat and punishment Bits stay sharp at speeds up to 20,000rpm's Each set includes an aluminum case for storage and display Router bits are in SAE measurements Product Description: With tungsten carbide blades, balanced craftsmanship and a solid hardened steel board, these router bits are designed to withstand years of heavy use. EDM router bits 1/2" 1/4" shank sets work great with all types of wood material, such as MDF, particle board, hardwood, softwood, perfect for edging, trimming, veining and grooving of woodworking for professional carpenters or beginners. Each set comes in a durable aluminum case for easy storage, organization and carrying.