The Faithfull Mastic Gun delivers superior performance, heavier gauge steel is used throughout the construction, and the ribbed finger grips on the larger handle ensure extra user comfort through 360º. The ratchet has a double spring mechanism for positive and precise sealant feed when the trigger is pulled, and an instant return upon release. Will accept all standard size adhesive and sealant A handy nozzle cleaning pin is provided, on the handle. Cartridges up to: 425ml.Barrel length: 285mm.