You are purchasing a Defender Tow Bar Stainless Steel Fixing Kit (as YRM RC012)

A4-80 is the equivalent of Mild Steel 8.8 high tensile bolts

Fixing Kit includes;
2no M6 A4-80 x 25mm Hex Head Bolt
4no M6 A4 Flat Washer
2no M6 A4-80 Flanged Serrated Nut
2no M8 A4-80 x 30mm Hex Head Bolt
4no M8 A4 Flat Washer
2no M8 A4-80 Flanged Serrated Nut
3no M10 A4-80 x 30mm Hex Head Bolt
3no M8 A4 Flat Washer
3no M8 A4 Spring Washer
4no M12 A4-80 x 40mm Hex Head Bolt
4no M12 A4 Flat Washer
4no M12 A4 Spring Washer
2no M16 A4-80 x 40mm Hex Head Bolt
2no M16 A4-80 x 60mm Hex Head Bolt
6no M16 A4 Flat Washer
2no M16 A4-80 Nylon Nut