Locking Holder, Clear Horizontal Permanent Locking Plastic Card Holder. End Piece Snaps Permanently Into End of Card Holder to Lock Cards Inside. Must Break the Holder in Order to Remove the Cards. End Piece Included and Comes with Slot & Chain Holes. Holds Two 30 Mil (750 Mic) Cards. Insert Size 3 3/8" x 2 1/8" (86 x 54 mm). Quantity of 50.