What type do you use, had a set of one handed silverline, ok lasted 18 months, treated my self to some ck ratched type, cut 20 lengths 20mm and 1 length 25mm trunking, tried some 25mm today wont cut, just bending. Also find them hard to use as need to open with two hands and ratchet mechanism very big notches to close (small hands and arthritis) taking them back tomorrow for my hard earned cash back