IT IS THE PROFESSIONAL HAND TOOL CALLED SINGLE SIDED RATCHET CHAIN WRENCH 9INCH OR 220MM MADE WITH HEAVY QUALITY MATERIAL OF CARBON STEEL . IT IS GENERALLY USED IN TIGHTENING AND LOOSENING OF NUTS , BOLTS ETC. IN CAR , MOTOR REPAIRING WORKS , PIPES AND OTHER FASTENERS. IT IS MULTI-FUNCTIONAL CHAIN WRENCH , QUICK RELEASE CLAMPING . IT IS GENERALLY DESIGNED TO WORK IN CONFINED AREAS WHERE REGULAR PIPE WRENCHES ARE NOT FIT. IT IS THE GREAT HAND TOOL FOR HOME AND FOR PROFESSIONAL USES.