The RAM® Strap Hose Clamp Base (RAM-108BU) consists of a 1.5" diameter C-Size ball connected to a base with single strap. The strap will accommodate rails from 1" to 2.1" in diameter. KEY FEATURES C-Size 1.5” ball (1) #20 Worm Drive Strap Clamp (1) #28 Worm Drive Strap Clamp (1) 6" Rubber Strip Keeping a close eye on utility diagnostic tools or GPS can be a lot easier with the right accessory. The RAM® Strap Hose Clamp Base can keep your devices and electronic tools close at hand.