Code 100. Designed for fitting two modules or other track arrangements together, this unique accessory from WalthersTrack requires no trimming! Other features include: Adjustable center section expands overall length from 8-7/8" to 9-3/8" 22.5 to 23.8cm Center section features special tight-fitting joiners for positive electrical contact Built tough for repeated adjustments Ideal for connecting modules and filling track gaps Use in place of any standard 9" (22.8cm ) straight snap track section Cutouts at both ends for standard rail joiners - no modification needed Compatible with all Code 83 and Code 100 track Custom formulated nickel silver rail for outstanding electrical conductivity Ties molded in realistic dark brown with enhanced wood grain detail