... HELD MOTOR OPERATED ELECTRIC TOOLS. HT1010 SERIES ARE MULTI-SPEED TRIGGER SWITCHES WITH BY-PASS CONTACT, INTEGRATED DUSTPROOF, ... ACCESSORIES, AS FOLLOWS:FULL-WAVE SPEED CONTROL; HALF-WAVE SPEED CONTROL ; DOUBLE SPEED ; INVARIABLE ROTATE SPEED WITH FEED BACK; ON-OFF ... MOTOR-OPERATED ELECTRIC TOOLS,SUCH AS:DRILLS, IMPACT DRILLS, ROTARY HAMMERS, JUG SAWS, RECIPROCATING SAWS, SABRE SAWS, ELECTRIC MIXERS ...