The Wilson Combat® 1911 ETM 9mm Lo-Profile Base Pad is tool-free and works with a variety of 500 Series ETM magazines. Long-lasting corrosion and shock resistance are provided by nitride-coated steel structure, which also improves handling in high-action areas. Compatible with ETM magazines #500-9, #500-9C, #500-9CD, and #500-9S. contains a base pad.