1,Material:JIS SKD61 2,S.H Surface Hardness :HV1000 Ejector sleeves mold parts good quality with low price. Ejector sleeves Ejector sleeves Detailed Product Description.1,Material:JIS SKD612,Hardness 3,I.H Inner Hardness :HRC42±2° 4,S.H Surface Hardness :HV1000°5,Concentricity ≤ 0.03 Our main products include high precision mould components such as ejector pins,Slide retainters, Latch lock, Date ...