For Gas and Mechanical Spring adjustment Chrome plated 5/16" hex ~10" lg. x 3-1/4" See Notes below regarding special markings on the tool to refer to when making ad FEATURES * For Gas and Mechanical Spring adjustment * Chrome plated * 5/16" hex * ~10" lg. x 3-1/4" * See NOTES below regarding special markings on the tool to refer to when making adjustments to Gas Springs. The Service TIp below applies only to Gas Springs, not Mechanical Springs. FITS: Rear Support Knuckle MODEL(S) THIS PART FITS: LFII, LFIIIC, LFIIIT & LFIIICB NOTES: SERVICE TIP: WHEN MAKING ADJUSTMENTS TO GAS SPRINGS ONLY -The RPI Spring Tool has special markings right on the tool itself to help you make tension adjustments to the Gas Springs. These markings indicate the MAXIMUM distance you should insert and turn the Spring Tool. Using these markings when making adjustments can help you avoid a potential jam. In addition, if you reach these markings and the Gas Springs do not respond, then the Gas Springs must be replaced. (IMPORTANT: THESE MARKINGS ARE NOT INTENDED FOR USE WITH MECHANICAL SPRINGS.)