1 Extension Bar Set + 2 Snap-Loc Dolly Push Bars = 1 Panel Bar Set. Extension Bars can also extend height of Push and Panel Bars! These 15" long heavy duty steel bars are protected with a durable heat treated powder coat. Another great feature of bar sets is our multipoint disconnection design great for storing away in a small space. Snap-Loc also offers a variety of System Accessories and Straps for most every type of application. Snap-Loc is Ultimate Cargo Control!