PVC Base Glide S&W P/N Max Load (lbs) Thread Size Base Dia Thread Length Total Length Package Qty SW-4T51 50 1/4-20 1-1/8″ 1/2″ 15/16″ 12 SW-4T52 50 1/4-20 1-1/8″ 1″ 1-7/16″ 12 SW-4T54 50 5/16-18 1-1/8″ 1″ 1-7/16″ 12 SW-4T55 50 5/16-18 1-1/8″ 1-1/2″ 1-15/16″ 12