... , THE TRIGGER AND LEVER CAN ACCORDING TO CUSTOMER'S REQUIREMENTS.OPTIONAL WITH FUNCTIONS OR ACCESSORIES, AS FOLLOWS:FULL-WAVE SPEED CONTROL; HALF-WAVE ... 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