500 Pieces Grommet and 500 Pieces Washer Grommet Kit Finish Grommet Eyelet for Clothes Fabric Leather Tag Bag (3/8 Inch) Silver 3/8 Inch industrial This acoustic air-tube surveillance kit

This acoustic air-tube surveillance kit provides clear voice transmission and excellent focused sound quality

aligning components

Built-in thermistor detects low temperature and suspends watering

Potentiometer can be adjusted to control the contrast

500 Pieces Grommet and 500 Pieces Washer Grommet Kit Finish Grommet Eyelet for Clothes Fabric Leather Tag Bag (3/8 Inch) Silver 3/8 Inch industrial This acoustic air-tube surveillance kit500 Pieces Grommet and 500 Pieces Washer Grommet Kit Finish Grommet Eyelet for Clothes Fabric Leather Tag Bag (3 8 Inch) Product Features Size information: the inner diameter of the grommet is approx. 3 8 inch 10 mm, its outer diameter is approx. 9 16 inch 14. 5 mm, its length is approx. 3 16 inch 4. 5 mm, light and portable, easy to deal with What's included: you will obtain 500 sets finish grommet eyelets, each set includes 1 piece grommet and 1