Accurate specifications: The stomat has accurate size (the handle diameter x l: 1/4In x 1-15/16In; the screw head diameter x diameter x L: 3/4In x 3/8In x 5/8In And 3/4In x 1/4In x 5/8In) can provide accurate and secure accessories to the stability and accuracy of cutting and grinding work. and rust-proof materials - this heart shaft is made of high-quality A3 carbon steel, with black , long service life and strong rust resistance. The strong structure with a strong mold grinding machine to that it can withstand reuse and maintain performance over time. The general type suitable for grinding machines and rotation tools - 1/4In of the heart shaft Sweet design ensures that most grinding machines and drilling rotation tools. Efficiency of professional and DIY tasks. Easy to install - this heart shaft is designed with a double thread head, surpassing the basic cutting task. It is suitable for a series of wheels, including grinding, polishing, cleaning and polishing, and sawing pieces, making it an indispensable accessory for any mold grinding tool package. Multi-functional installation options - The cardiac shaft can process 3/8In and 1/4In heart shaft size, which is very suitable for small diameter cutting wheels. Its adjustable threaded neck length is compatible with the type of cutting wheel with a thickness of 0.035In to 1/4In, which provides flexibility for different project needs. Quantity:4 Pack Colour:Black Material:Metal Package Contents: 4 * Mounting Mandrel 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.