Material: The cable railing kit is made of stainless steel marine grade, which has strong tensile strength, very strong and durable. It is rust and corrosion resistant and designed for installation of indoor and outdoor deck railings, even in locations. Sleek and clean look, yet most cost-effective. This cable railing kit covers drilled rough holes for a stylish clean. This cable railing system 't block your view when you're lounging on deck. It also requires little maintenance. Unlike the turnbuckle system, this simple deck cable system (protector + lag screws) cuts the cost by 1/4. We think its combination of strength, light weight, looks and cost-effectiveness perfect for residential or commercial. Protects posts and maintains cable tension. This stainless steel sheath is designed to protect relatively soft wooden posts from damage due to abrasive wear. It maintains cable tension to prevent vibration. Important note, this level of cable railing hardware can only be used on intermediate wood posts, not on metal or corner posts. Dimensions: Hole ID: 7/32inch; Overall Length: 13/16inch; Drill Diameter: 6.5MM. These Cable Sleeves are suitable for 1/8inch 5/32inch and 3/16inch Cable Railing Systems. Calculation for the number of Sleeves required: 2 x Number of Intermediate Posts x Number of Cable Runs. Packing List: 70pcs Stainless Steel Protective Sleeves tube, 1 drill bit. DIY a cost-effective cable guide system, refer to Figure 1. 6: Protective sleeve DK11, tension screw DL30, hydraulic crimping device DC01, drilling tool DG12 Colour:silver Material:Stainless steel Package Contents: 70 x Protector Sleeves 1 x drill bit 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.