Ratchet glass showcase lock; chrome plated; body diameter 33mm; cylinder diameter 22mm; cylinder projection 17mm; ratchet arm length 117mm; 2 keys supplied; maximum glass thickness 7mm; ratchet arm is fitted to rear sliding door; lock body slides along the arm to butt up tight against the edge of the front sliding door, thereby preventing the two doors from passing each other; released by use of a key.