Check the listing for details. RAM-2-1M RAM Metal Knob, Bolt & Spring Hardware for C .... Color: Black, Condition: New. Listed at 26.94 USD. RAM Metal Knob, Bolt & Spring Hardware for C ... RAM-2-1M Genuine RAM Products! The RAM-2-1M provides all of the replacement hardware needed to replace the standard knob on your C size arm with a metal know with Jam Nut.hardware included (1) 5/16 INCHES -18 x 2.5 INCHES Hex Bolt(1) 2.15 INCHES Spring(1) 5/16 INCHES Stainless Steel Washer(1) .77 INCHES Nylon Washer(1) 5/16 INCHES -18 Brass Nut(1) 5/16 INCHES -18 Jam Nutmaterials Knob: Marine-grade aluminum with brass nut insertpackaging type Retail BagWeight 0.32 lb hardware included (1) 5/16 INCHES -18 x 2.5 INCHES Hex Bolt(1) 2.15 INCHES Spring(1) 5/16 INCHES Stainless Steel Washer(1) .77 INCHES Nylon Washer(1) 5/16 INCHES -18 Brass Nut(1) 5/16 INCHES -18 Jam Nut materials Knob: Marine-grade aluminum with brass nut insert packaging type Retail Bag Weight 0.32 lb