... ALL KINDS OF HAND HELD MOTOR OPERATED ELECTRIC TOOLS. HT1010 SERIES ARE MULTI-SPEED TRIGGER SWITCHES WITH BY-PASS CONTACT, ... WILDELY USE IN ALL KINDS OF HAND HELD MOTOR-OPERATED ELECTRIC TOOLS,SUCH AS:DRILLS, IMPACT DRILLS, ROTARY HAMMERS, ... JUG SAWS, RECIPROCATING SAWS, SABRE SAWS, ELECTRIC MIXERS, POLISHERS, ORBIT SANDERS ECT. DUSTPRO OF AC TRIGGER SWITCH WITH VARIABLE SPEED