Big-Screw tungsten syringe shields with large screw at the back to easily hold the syringe steady inside the syringe shield. The Big-Screw syringe shields are shielded with 2 mm tungsten and a 5.2 density lead glass viewing window. The body of the tungsten syringe shields is finished with anodized aluminum for cleanability and decontamination. This Big-Screw tungsten syringe shield is designed for 3 ml syringes.