Ernst 8450 RD and 8451 BL Socket BOSS High-Density Tray Socket Rail Socket System 2 Boss Tray 19.5" Long (over hang ends) 3 Blue Universal Socket Rail 18" Long, 3 Red Universal Socket Rail 18" Long 15 each 1/4", 3/8" and 1/2" Drive Socket Twist Lock Clips 6 Sets (288) Fractional (SAE) and Metric Socket I.D. Stickers for easy socket identification Transportable / Secure / Versatile, Holds 45 sockets each / Unlimited configurations options