RAM Mount RAM® Tough-Ball™ w/1/4"-20 x .50" Threaded Stud f/KayaksRAM Tough Ball with 1 4" 20 x . 50" Threaded Stud for Kayaks The RAP 379U 252050 KAY1 consists of a 1. 5" diameter rubber ball, connected to a 1 4" 20 X . 50" male threaded post and tooth lock washer. Hardward Included: (1) 1 4" Tooth Lock Washer Thread Pitch: 1 4" 20 x . 5" Ball Socket Size: C Size (1. 5") Weight Capacity: 4 lbs Materials: High strength composite Stainless steel threads RAM provides a diversified product line, protected by more than