Features: brand new and high quality Made of high-quality carbon steel materials, practical and durable. It is a good choice for those who do DIY at home. Portable size, easy to use and carry. We offer 5 kinds optional, you can choose one or more according to your needs. Great workmanship, with strict quality control and quality assurance, high safety factor, can be used with peace of mind. Specifications: Material: Carbon Steel Size: As the Picture Show Type: A/B/C/D/E Package Includes: 1x M15 Screw Nut(All-in-one) 6mm 1x M15 Screw Nut + 04007-6 1x M15 Screw Nut + 04007-6.35 1x M15 Screw Nut + 04007-8 1x M15 Screw Nut + 04007-6/6.35/8 note: 1.Please allow 1-3cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.