CLOVER-Stacking Applique Pins. Each of these steel straight pins has a diameter of 0.4mm; a length of 25mm; and heat resistant glass heads-- great for applique and piecing 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 thirty pins and one stackable container. Container measures 1-3/4 inches long with a 5/8 inch diameter. Imported.