REC "NBM" Nickel Silver Uplock Seat, Features a milled slide band and hood, double knurled nut, butt cap, and fine threaded barrel. Recommended for #2 - 7 line weights. NBM seats have a .375 bore with .421 bore available for an additional $4.95. Available with beautiful impregnated rosewood or chestnut colors or natural cocobolo, birdseye maple or buckeye burl wood inserts. Please specify wood insert and insert bore.