Safco Products 4234CL Large Acrylic Collection Boxes, Clear Acrylic collection, suggestion box, drop box, deposit box, prize drawing box, etc. Top slot 5 3/4 x 1/2", accepts suggestion cards, sold separately Display area 8 1/2"W x 11"H, back panel slides out for easy access Lockable, includes lock and 2 keys Safco Products Suggestion Box Refill Pack Model 4231 available, sold separately