The forgefix roofing bolt kit contains a selection of the most popular sizes and is supplied in a handy forge pack contents 4 x cross mushroom head zinc plated roofing bolts m6 x 12mm 4 x cross mushroom head zinc plated roofing bolts m6 x 20mm 4 x cross mushroom head zinc plated roofing bolts m6 x 25mm 4 x cross mushroom head zinc plated roofing bolts m6 x 30mm 4 x cross mushroom head zinc plated roofing bolts m6 x 40mm 4 x cross mushroom head zinc plated roofing bolts m6 x 50mm 24 x zinc plated