The Greys Klip-Lok' bait boxes come in 3 sizes of modular base, each complete with an easy fasten and release lid design that clips securely shut on all four sides - also being interchangeable between all boxes in the range. These lids have tapered air holes Tough injection moulded polypropylene Same lid fits all sizes Klip-Lok(TM) fastening on all sides of lid Escape proof, secure seal rubber gaskets Locking feet for neat and secure stacking Clear perforated lids with tapered anti-clog holes Lid perforations are fenced in to prevent bait escape