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