These come in bags of 10, and in 2 sizes: M6 or M8. The M6 has a Pz2 head and requires a 6mm hole. They are 60mm long; the minimum hole depth in the substrate is 35mm with a maximum fixing thickness of 35mm.
The M8 is available in three lengths, all with Pz3 heads, and requires an 8mm hole with a minimum depth of 45mm. The 80mm length is for a fixing of 40mm maximum thickness, the 100mm for a maximum fixing of 60mm and the 120mm long for a maximum of 80mm thick.