The Silverline trimming knives are similar to the Stanley knives used by carpet fitters/floor layers, mastic sealant applicators for cutting out old sealants and debris prior to re-sealing and in fact anyone else who requires a solid, reliable and sturdy knife. A good product for a range of uses at a low price. Perfect for all trades from mastic sealant applicators to carpet fitters and more Heavy duty knife with double notched blade location for added security Easy blade change using solid brass notched wheel Complete with one heavy duty blade and polypropylene protective holster