Ask a questionSpecification: Material: High speed steelColor: as the picture showsM3 size: approx. 3mm x 0.5mmM4 size: approx. 4mm x 0.7mmM5 size: approx. 5mm x 0.8mmM6 size: approx. 6mm x 1mmM8 size: approx. 8mm x 1.25mmHigh hardness, fast cutting, high temperature consumptionSpiral groove is conducive to crumb removal, not easy to break the tapTap crumbs for spiral up evacuation chip, it is more suitable for processing blind holes and sticky materials Processing Applicable workpiece: tensile strength 750N/mm2 Or less low carbon steel, copper, aluminum, magnesium alloy; Bonding Strength 600 - 900N /mm2High Carbon Steel, Alloy Steel, Bronze, etcPackage Included:5pcs x Spiral Grooves With FaucetNote:The error may be 2-3mm due to manual measurementItem color displayed in the pictures may be showing slightly different showing on the computer monitor since self-payment monitors are not calibrated1) We accept Alipay, West Union, TT. All major credit cards are accepted through the payment processor's secure escrow.2) payment must be made within 3 days of placing the order.3) if you are unable to check out immediately after the listing ends, please wait a few minutes and try again, payments must be completed within 3 days. Shipping1.