ORIGINAL AL-KO lawnmower mower wheel sprocket ORIGINAL AL-KO CHARACTERISTICS VERSION T 1000 , T 1500 , T 13-102 HD , T 15-102 HD , T 16-92 HD-H , T 16-102 SP-H , 17-102 HD , T 18-102 HD , T 20-102 HDE AXLE DIAMETER 12 mm AXLE LENGTH 41 mm THREAD M8 CODE: 842521110 ORIGINAL CODE: 521110 , 52111030 SR