Peco SL-10 Code 100/124 Nickel Silver Rail Joiners.

Metal Rail Joiners. For connecting rail ends together. Provides both mechanical and electrical bonding.

Designed to be used with Peco 00/H0 Code 100 track systems (Ref nos. SL-100 and 102); also with 0 Gauge Bullhead (SL-700BH) and 0-16.5/0n30 (SL-500) track systems.
Recommended to be used with:

SL-100 00/H0 Track

SL-700BH 0 Gauge Track
SL-500 0-16.5 Track