REC "NBM SERIES NICKEL-SILVER UPLOCKING REELSEATS" - A high quality, light weight nickel silver seat. Recommended for 2-7 weight rods. Length 3.45", Diameter .665". Bores are .420. NATURAL WOOD INSERTS: (1)Cocobolo, (2)Curly-Koa, (3)Bacote, STABILIZED WOOD INSERTS: (4)Black-Ash, (5)Maple-Burl, (6)Box-Elder, (7)Buckeye-Burl