CROWNWALL Slatwall 55 lbs. 8 in. Locking Double Hook (3-Pack) DHK8-L-3P - The Home Depot
Source Safety Hook Anti-theft Hook for Slat Wall Retail Supermarket Shelf Security Hook with Detacher Sold in pack of 50pcs on m.alibaba.com
CROWNWALL Slatwall Locking Hook Kit (10-Piece) CW10-K - The Home Depot
50 Pieces White Black Color Retail Security Display Hook Anti-theft Locking Hook Slatwall Security Hanger+1 Piece Magnetic Key - Alarm System Kits - AliExpress
Amazon.com: XCHTX 20PCS Anti-Theft Security Slat Wall Hook 6" Display Hook with Magnetic Key for Free,Chromed : Industrial & Scientific