these blades can be screwed to the JLBM50PA, JLBM60PA and JLBM100 discs, the JLB blades made of treated high-strength steel allow precise cutting of discs made of soft materials such as gasket paper, foam, cardboard, leather, felt, cork, rubber, plastic , pulp, etc., the knives can be used manually by hammering onto the JLBM53PA holder, also can be installed on a manual press with a JLBM50PA, JLBM60PA or JLBM100 locating disc, the JLBM53PA holder can also be placed directly under a hand press