CLOVER-Stacking Fine Quilting Pins. Each of these steel straight pins has a diameter of 0.5mm, a length of 48mm, and heat resistant glass heads. They are thin with sharp tips-- great for a variety of quilting projects. They come in a slim clear plastic case that can be securely stacked with other cases to create one compact unit. This package contains twenty pins and one stackable container. Container measures 3-1/4 inches long with a 5/8 inch diameter. Imported.