these knives can be bolted to the JLBM20, JLBM30PA, JLBM50PA, JLBM60PA et JLBM100 holders, grips and mounting discs. The JLB- knives are made of high-strength treated steel and allow precise cutting of discs made of soft materials such as gasket paper, foam, cardboard, leather, felt, cork, rubber, plastic, fibrous material etc., the knives can be used manually by hammering on a JLBM20 receiving disc or with holder (JLBM30PA or JLBM53PA), can also be installed on a manual press with a JLBM50PA, JLBM60PA or JLBM100 receiving disc, the JLBM30PA and JLBM53PA handles can also be placed directly under a manual press