The Snap-on Magnetic Holders, Nos. 38MSWHLDR, 14MSWHLDR and 12MSWHLDR, attach directly to tool storage units. The socket and wrenches are held in place with high-impact Nylon 66 plastic that resists oil and grease to keep tools from slipping. All three models feature replaceable clips if lost or broken and are equipped with eight powerful magnets covered with protective foam to hold the rails in place on any ferrous metal surface. Available in 1/4” (14MSWHLDR), 3/8” (38MSWHLDR) and 1/2” (12MSWHLDR), these magnetic holders are designed for SAE and metric sockets and wrenches.