The modular concept of the "Double Force" clamping system allows for an incredibly wide range of applications. There are 2 different rail cross sections available, SLV models are 27 x 13 mm (1 1/16" x 1/2"); the GSV model has a 30 x 15 mm (1 3/16" x 5/8") profile for high clamping forces. Clamping widths range from 16 to 118 In. The rail end slide stops can be removed without tools. This allows for quick changes to the clamping set up. You can easily reverse the sliding arms for spreading or add extra sliding arms for clamping multiple pieces. Create custom assembly jigs for large assemblies quickly & easily. This versatility makes creating custom setups even for just one time use an economical prospect. SLV sliding arms available in 3 different styles, all with a 4-3/4 inch throat depth. GSV sliding arms all have spindles with sliding T-bar handles & are equipped with heavy duty MorPads for maximum clamping force. The standard GSV300M clamp sliding arms have a throat depth of 5-1/2 inches. There are also 4-3/4 & 7-1/2 inch throat depth versions available. The clamping system's flexibility means numerous applications can be handled by the various combinations of rails and sliding arms. Clamp more with less using this unique BESSEY clamping system. BESSEY. Simply better.