With the help of the ball chains the animal can also be held firmly in position. Four feet will lift the platform by 1.5 cm to facilitate the locking of the retractor chain. The ball chain retractors are of stainless steel, 21 cm long, with a sharp hook at one end. 5 mm wide stainless steel hooks can be attached to the sharp hooks if it is desired. The stainless steel chain elevators are 8.5 mm high and slip securely over the edge of the plate.