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The knob is knurled to allow easy turning on or off your rig Dimensions 5/16" bolt hole size 3/4" Overall Length 1" Overall head diameter Sold as a SINGLE "1" or purchase a pair and save $$ Write a review Write a review Rating Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email Comment Piranha's Price: $6.49 Purchase a Pair (2) of Knobs Pair of 5/16 Knobs (+$3.00) 6619:+:0,6618:+:3
 "Backplate Knob 5/16 Inch \"Electro-Plated\"")