The Castle solid carbide woodworking router bit is your best bet for long-lasting, consistent performance. This bit is exceptional in routing all materials, including composites and dense hardwoods such as hickory. The three-flute bit can be resharpened, furthering its already extensive lifespan. When you are in need of premier woodworking tools and supplies, turn to Castle, Inc. We pride ourselves on providing our customers with the absolute best and highest quality carpentry supplies. Technical Specifications: 3/8” woodworking router bit; Three flute; Made of solid carbide; Can be resharpened; Exceptional in routing all materials.