Opening 300mm Throat 50mm. Originally intended for use where moderate clamping pressure was to be applied; Bessey's LM Series quick action clamps have proven highly successful in DIY and industrial sectors alike. Particular applications this type of clamp suits include model and instrument making; light engineering and various home workshop tasks. LM series clamps have a throat of 50mm and are supplied with plastic caps. They are die cast and are intended for light duty work.