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791153066B Trimmer Head Bump Knobs 791-153066B Fits Murray M2500 M2510 2 PackTwo (quantity 2) aftermarket bump knobs part number 55803 that replace Murray part numbers 791-153066,791-153066b and 153066. This fits Murray trimmer models M2500 and M2510. This knob has a male 5/16-18 Right Hand (turns counter clockwise to remove) thread. Parts can be returned within 30 days if uninstalled and in same condition as received. Refund will be issued for purchase price minus cost of outgoing shipping. Buyer is responsible for return shipping charges. Buyers in California pay 7.75% sales tax.