THIS VERY POPULAR ORBITAL BUFFER IS THE PERFECT TOOL FOR  AUTO BUFFING AND POLISHING. THE PORTER CABLE 7424 BUFFER FEATURES RANDOM SWIRL-FREE  POLISHING ACTION. IT CONVERTS BETWEEN A 6” RANDOM ORBIT BUFFER AND SANDER. THE DESIGN IS A 100% BALL BEARING DESIGN. (THE SPECIFICATIONS ARE AS FOLLOWS:  120V AC, 3.7 AMPS, NO LOAD OPM 2500-6000,  SPINDLE THREAD 5/16”-24, POLISHING PAD SIZE IS 6”, LENGTH IS 11.5”, WEIGHT IS 5 ¾ LBS. (STANDARD EQUIPMENT FOR THIS BUFFER INCLUDES: 7424 CAR BUFFER, 5” COUNTER-WEIGHT, 6” FOAM POLISHING PAD, WRENCH AND OPERATING MANUAL.) THE BONUS ITEMS OR EXTRAS RECEIVED WITH THIS PURCHASE INCLUDE A 6” COUNTER-WEIGHT  AND A 6” BACKING PLATE. THE 6” COUNTER-WEIGHT SHOULD BE USED WITH 6” BUFFING/POLISHING PADS. THE 6” COUNTER-WEIGHT SMOOTHS OUT THE ORBITAL ACTION OF THE 6” PADS. IT PREVENTS UNNECESSARY VIBRATION AND POSSIBLE DAMAGE TO THE UNIT. THE ONLY EXCEPTION IS WHEN USING THE 6” PAD WHICH COMES WITH THE BUFFER. THIS FOAM PAD, DUE TO ITS LIGHT WEIGHT AND SMALL DIAMETER BACKING PAD (INCLUDED WITH IT), CAN BE USED WITH EITHER THE 5” OR THE 6”  COUNTER-WEIGHT. THE PORTER CABLE 7424 COMES OUTFITTED WITH  THE 5” COUNTER-WEIGHT. WHEN NEEDED, THE CHANGEOVER TO THE 6” COUNTER-WEIGHT IS A SIMPLE TASK.