av无码网址福利_超碰aⅴ亚洲中文字幕_亚洲三级片区无码_亚洲欧洲无码精品Ⅴa

Main Products
Products Grade: 50CrVA
Specifications: φ5.5~16mm
Applied Standard:  agreement
Characteristics: As usual,this product is used to produce screwdrivers
Applications: Hand tool steel
Use of Products: This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, good surface quality.