Twotrees 3.9mm Ultrasonic Engraving Blades for U1 & U2

Twotrees 3.9mm Ultrasonic Engraving Blades for U1 & U2 | Black Steel & Carbon Steel Carving Replacement Bits Description Specification: 3.9mm shank, available in 10pcs & 50pcs These are the Twotrees 3.9mm ultrasonic engraving replacement blades – precision carving bits perfectly compatible with Twotrees U1 & U2 ultrasonic engraving knives. Available in two materials to suit different carving needs and budgets: Black Steel for professional continuous carving and Carbon Steel for beginner practice and general wood craft processing. Compatible with hardwood, plywood, MDF and fiberglass. Black Steel Blade – Key Features: U1 & U2 Compatible – 3.9mm black steel engraving blade, available in 10pcs & 50pcs pack, perfectly fits Twotrees U1 & U2 ultrasonic engraving knife. Anti-Rust & High Toughness – Black steel with special surface treatment; anti-rust and high toughness maintains sharpness for continuous carving work. Smooth Burr-Free Cutting – Works on hardwood, plywood, MDF & fiberglass; provides smooth burr-free cutting for all wood carving projects. Carbon Steel Blade – Key Features: U1 & U2 Compatible – 3.9mm carbon steel blade 10pcs, perfectly compatible with Twotrees U1 & U2 ultrasonic engraving knife. Sharp & Lightweight – High carbon steel sharp cutting edge; lightweight cutting with high cost performance for daily wood carving. Beginner-Friendly – Works on hardwood, plywood, MDF & fiberglass; ideal for beginner practice and general wood craft processing.