I used the item about 6 times to attach a video camera onto a car roll bar, but has a vast amount of uses.
Please view the Manfrotto website www.manfrotto.com. I think it was around £70 for both parts.
Twin swivelling 16mm spigots and single lever lock.
Supplied with camera/umbrella bracket £45.
Contact Simon on simon.turner@motorolasolutions.com