Double penetrator vac-u-loc attachment. This is an awesome accessory for our vac-u-lock strap on harness or as an attachement for our fucking machines (below). It works very simply. There is a tight hole at the base of the dildo that locks on to the vac-u-lock shaft. The larger Realistic dong measures 6 inches from base and is about 1 1/2 inches thick. The smaller "anal" dong is 5 inches from the balls and about 1 inch thick. It can be moved to the side, if you're not interested in anal penetration.