Each tool holder comes with a TiN Coated indexable carbide insert with positive rake cutting angle and built-in chip breaker great for general cutting action. 7 PIECES LATHE INSERT TOOL HOLDERS : the material of the holder is 40Cr steel, black oxide smooth finish on each turning tool holder marked with tool holder style and size. Typically used for threading, turning, cutoff, boring, facing, external grooving, etc. 7 PIECES INDEXABLE CARBIDE INSERTS: the material of the insert is carbide,the inserts can be used for finishing or semi-finishing steel, the inserts has high hardness, low friction coefficient, good wear resistance and chemical stability. color:Black Material:Metal Package Contents: 7 x 10mm Indexable Carbide Lathe (SDNCN1010H07, SDJCR1010H07, SCLCR1010H06, SER1010H11, MGEHR1010-1.5, S10K-SCLCR06, SNR0010K11) 7 x Indexable carbide inserts (MGMN150-G, CCMT21.51 x 2, DCMT21.51 x 2, 11ER A60 , 11IR A60) 7 x wrenches 1 set x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.