Features: Functions:The thread sleeve can obviously improve the strength and wear resistance of threaded connection; Prevent thread looseness and slippage. Size: M3/4/5/6/8 thread sheathin this set which can meet all of your different needs. Thread Repair:If your thread is slippery and can no longer be used reliably, use a reducing screw to repair the thread. With Torsion Groove: The thread sheath has a card groove, which is convenient for manual tapping tools. Material: This thread sheath ismade of high-quality stainless steel, the nut has a smooth body without burrs, uniform force. Specifications: Material: Stainless steel Quantity: 240pcs Size: M3/4/5/6/8 Application: Low-strength metal and non-metallic materials (such as aluminum, magnesium, cast iron and other low-strength light alloy materials and low-strength engineering materials such as plastic, rubber, density board, bakelite, ceramics, glass fiber reinforced plastics, wood and so on. includes: 30pcs*M3*2.3 30pcs*M3*5.2 30pcs*M4*3.3 30pcs*M4*7.2 30pcs*M5*4.3 30pcs*M5*8.5 20pcs*M6*5.3 20pcs*M6*10.5 10pcs*M8*7 10pcs*M8*14.5