Industry standard long-frame B-gauge and bantam (4.4mm) jack sockets. Frames are zinc plated and clear passivated mild steel, with polished brass sleeve. Bantam types have closed frame construction for extra strength. Switch contacts are palladium/silver. Contacts available stacked vertically or horizontally (defined with fixing hole vertically above plug entry – i.e. vertical type has connection lugs stacked vertically above each other, horizontal type has them side-by-side horizontally). Horizontal type are the ones normally used in B-gauge jackfields, vertical on bantam jackfields. Jacks have solder lug connections. Mounting bush to permit flush panel mounting of B-gauge with plain sleeves also available, stock code 43-600.