5.25" Stainless Steel Chock. Hidden studs included with backing plate. Maximum line size 3/4" (19mm), Length 5.25" (133mm), Width 1.5" (38mm), Height 2.16" (55mm), Stud size 12mm, Center to Center (stud) 3.75" (95mm), Max Deck thickness 1.88" (48mm), Min Deck thickness .38" (10mm), Weight 2.21 lb (1 kg)