Chip Racks and Spacers CRK039-66 (Pictured), Clear Acrylic, 39mm (66.7 Insert) CRK039-67 Clear Acrylic, 39mm (67.7 Insert) CRKPS66 Polystyrene, 39mm (66.7 Insert) CRKPS67 Polystyrene, 39mm (67.7 Insert) CRK050 Clear Acrylic, 50mm CRK043 Clear Acrylic, 43mm CS10 Clear Acrylic Chip Spacers