Set Of Steel Grit For One Set Contained (1) Gh18=210 Kgs, (2) Gh25=140 Kgs (3) Gh40=70Kgs. Tota L One Set Consists=420. Specification: (1) Sae J444 Rev-May 93, (2) Sae J1993 Rev Sep 96 [ Warranty Period : 30 Months After The Date Of Delivery ] ]