For channel nut style racks (Front Runner).Requires T27 security bit (not included).M8 Handle Kit for Front Runner & Zarges Brackets contents: Requires T40 security bit (not included).M6 & 1/4-20 fasteners require a T27 torx security bit (not included).M8 fasteners require a T40 torx security bit (not included).High-quality tamper-proof fasteners require a security bit.Spring nuts and studs can be inserted without access to the end of the channel.Spring nuts stay in place when not in use.Stainless nuts and fasteners where possible.Fits many aftermarket roof racks and cross bars.M8 kits are compatible with Zarges Roof Rack Mounts.Just let us know what brand of roof rack you have (pictures always help!) and what you’d like to mount and we will make it happen! Please contact us if you need a different combination of fastener lengths and we will be happy to assemble a custom kit for you. The fasteners used in the non-stud kits are security type unless noted, which requires a security bit (not included) – easily available at your local hardware store. We’ve created these handy hardware kits for use in all kinds of racks and mounting systems that feature triangular channels (t-slots) or square channels for hardware.