ATLAS Code 100 1/2 18" Radius Nickel Silver (4) HO This is a Package of Four HO Scale Code 100 1/2-18" Radius Section Pieces from Atlas. For experienced train collectors. FEATURES HO scale. Track pieces are 4-3/4" long. 4 total pieces within carded package. Easy Snap-Track assembly. Rail is .100" high. Quality precision, evenly spaced black ties and nickel silver rails. Code 100 track is compatible with most code 83 track by using Atlas' Transition Joiners. Universal joiners included. INCLUDES Four HO Scale 1/2-18" Radius Section Pieces REQUIREMENTS HO Scale Train Track and Equipment SPECIFICATIONS Length: 4-3/4" (12.3cm) Scale: HO Code: 100 Radius: 1/2-18"