Buy Galvanised through bolts, anchor fixings, concrete anchors online from ParkerTools. Leading suppliers of a wide range of fixings and fasteners to industry and DIY users. Anchor fixings, structural fixings and general fixing solutions for home or work areas. A through bolt / anchor bolt is used to attach objects or structures to concrete. There are many types of through bolts / anchor bolts. All consist of a threaded end, to which a nut and washer can be attached for the external load. It is split three ways for even stress distribution to the concrete. The deep sleeve & matching deep land on the bolt maximize the expansion area for increased holding power.