long plastic shafts and 1/2 in.
, Plastic w/Steel These window grid retainer pins are used for securing decorative mullions to stationary and operating wood windows of all types and sizes. long plastic retainer sleeves, ideal for mounting mullion grids over the glass area of wood windows. They feature a 5/8 in. Window Grid Retainer Pins and Sleeves, 1-1/16 in.