Detail 1 Set 5 Pcs Tlg HSS Countersink Countersinks Wood Metal 6-19mm 90 Degree Individual Flute Inserts and 1 Set 1451 Set Red and 1 Set Oil Seal Ring Ø90 Degree Individual Flute Drill Bit Inserts:Material: Carbon Steel Surface Treatment: Nitriding + Gold FinishSpecification: 6mm, 10mm, 13mm, 16mm, 19mm 5 Pieces Metric Diameter:6mm: 6mm Shaft Diameter, 6mm head, for chamfering 1mm-4mm hole; 10mm: shaft diameter 6mm, head 10mm, for hole chamfering 2mm-5mm; 13mm: shaft diameter 6mm, head 13mm, for chamfering hole 5mm-9mm; 16mm: shaft diameter 6mm, head 16mm, for chamfering frames 7mm-12mm; 19mm: shaft diameter 6mm, head 19mm, for frame chamfering 8mm-13mm; Intended use: for low hardness of the workpiece such as wood. When using the chip removal cutting edge, the cutting edges are not easily dull! Use for home and industry. Oil O Seal Ring: Freon resistance, oil resistance, waterproof, ultraviolet defense, corrosion resistant. This o-ring oil seal is made of HNBR material round section, easy to install. Applications: Automotive, Electrical Equipment, Mechanical Engineering, Industry, Construction, Household, Other Fields. Material: HNBRColor: PurpleModel: 6.07x1.8(20pcs) 7.65x1.78(20pcs) 14x1.78(20pcs) 6.8x1.9(15pcs) 10.82x1.78(20pcs) 10.8x1.78(15pcs) 12.42x1.78(20pcs) 13.8x2.4(15pcs)Package Contents:145 x O-ring Oil Seal1 x Plastic Container Introduction of 5x90 Degree Single FluteOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.