150Pcs 7mm Inner Dia PVC Flexible Vinyl End Cap Screw Thread Protector Cover Red Indicator Lights Overall Size : 38 x

Overall Size : 38 x 80mm / 1

Not just for test tubes

it grips the flat sides of fastener heads rather than the corners

Constructed of sturdy metal materi al for long time use

3 cm (Appro H*D)

150Pcs 7mm Inner Dia PVC Flexible Vinyl End Cap Screw Thread Protector Cover Red Indicator Lights Overall Size : 38 xUsed for protecting screw thread point. Simply slide over the threaded end of the screw or bolt, also easy to take off. The flexible vinyl material stretches over the threads to provide a tight seal, cushions the threads against damage. Applications include: protection during transport, protection against liquids or dirt.