7/16 In. Steel Sliding Window Roller Assembly, Krestmark (2-Pack)
Compatible with Krestmark windows. It features a center-grooved roller. Typically used by Krestmark. Roller width (in) 0.18. Builders Hardware Product Type Window Rollers/Guides. Warranty is void if products are subjected to abnormal conditions, misapplication or abuse.
7/16 In. Nylon Rollers, Sliding Window Tandem Roller Assembly, Milgard (2-Pack)
Designed to fit Milgard windows. This is a white plastic housing with flat edge tandem plastic rollers. Used by Milgard and a variety of other window manufacturers. Can be installed with a few simple tools.