... and the spacer is installed between the two w-beam steel guardrails. During road being normal operation ... 3. Complete configuration and usage amount.Highway w beam guardrail set includes: w beam, (flange) post, post cap, ... reflector etc.What is the most commonly used models for w beam guardrail is Gr - A - 4 E ... nut 250 sets for M16 * 170, 250 sets for M16 * 42, 2000 sets for M16 * 35. W beam guardrail a ...