HSS Industries is a distributor of mailing systems, offering a range of products including horizontal and vertical collection box units, rotary mail centers, post office boxes, express mail convenience centers, indoor and outdoor parcel lockers, postal stamp vending cabinets, and library collection and drop units. Their services also include USPS 4C Horizontal Mailboxes, retail lobby furniture, secure collection boxes, dVault Boxes, and various postal products and parts. HSS Industries caters to the postal industry with a diverse selection of mailbox modules, parcel lockers, and secure collection solutions.