uxcell 50 Pcs 3mm LED Lamp LED Bulb Holder for Light-emitting Diode Lighting Silver Tone Package Content : 50(+/_2%) Pcs x LED Lamp Holders; Thread Diameter : 5.5 mm / 0.22" Fit LED Diameter : 3mm Total Length : 9.5 mm / 0.37" Safety locking screw in base for secure fitting; Durable, heatless and long-lasting