Features [Easy to operate] 304 stainless steel screws and nuts have high hardness and are not easy to break. [Not easy to fall off] The precision wire can be easily tightened and not easy to fall off. [Easy Accessible] Carefully packaged and placed in a resealable transparent box for easy storage and carrying. [Meet basic needs] M 4 metric standard dimensions, suitable for daily basic maintenance and installation and DIY requirements. [Safe and Reliable] The brass bracket is resistant to rust and corrosion and can protect the workpiece from damage. Specification: Item Type: Spacer Screw Nuts Set Screw nut material: 304 stainless steel Spacing material: brass Model Quantity: 304 Stainless Steel Nut M4 20pcs. 304 stainless steel screws M4x8mm 20pcs Brass male-female spacer M4 (6mm + 6mm) 10pcs Brass male to female spacer M4 (10 mm + 6 mm) 10 pieces Brass male-female spacer M4 (15mm + 6mm) 10pcs Brass male to female spacer M4 (20 mm + 6 mm) 10 pieces Brass female-female spacer M4 (6mm) 10pcs Brass female-female spacer M4 (10mm) 10pcs Brass female-female spacer M4 (15mm) 10pcs Brass female-female spacer M4 (20mm) 10pcs Package List: 20 x 304 Stainless Steel Nut M4 20 x 304 Stainless Steel Screws M4x8mm 10 x Brass Male-Female Spacer M4 (6mm + 6mm) 10 x Brass Male-Female Spacer M4 (10mm+6mm) 10 x Brass Male equal woman spacer M4 (15mm + 6mm ) 10 x Brass Male-Female Spacer M4 (20mm + 6mm) 10 x Brass Female-Female Spacer M4 (6mm) 10 x Brass Female-Female Spacer M4 (10mm) 10 x Brass Female-Female Spacer M4 (10mm) 10mm 0 x brass woman. Equal Female Spacer M4 (15mm) 10 x Brass Female-Female Spacer M4 (20mm) Package List 20 x 304 Stainless Steel Nut M4 20 x 304 Stainless Steel Screws M4x8mm 10 x Brass Male-Female Standoff M4 (6mm+6mm) 10 x Brass Male-Female Standoff M4 (10mm+6mm) 10 x Brass Male-Female Standoff M4 (15mm+6mm) 10 x Brass Male-Female Standoff M4 (20mm+6mm) 10 x Brass Female-Female Standoff M4 (6mm) 10 x Brass Female-Female Standoff M4 (10mm) 10 x Brass Female-Female Standoff M4 (15mm) 10 x Brass Female-Female Standoff M4 (20mm)