About these items:Linear Motion Kit SFC16 1000mm: This kit includes two 39.4" (1000mm) linear rails, four SC16 slide blocks, and four support brackets, providing precision and durability for automation and CNC applications. With a dynamic load capacity of 774N per block and static load capacity of 1180N per block, this set is perfect for projects requiring smooth, high-precision motion.Linear Guide Set SFC20 1000mm: This set features two 39.4" (1000mm) SFC20 guide rails, four SC20 slide blocks, and four support brackets. With a dynamic load capacity of 882N per block and static load capacity of 1370N, it's ideal for high-load automation tasks such as CNC machines, 3D printers, and other DIY projects, offering excellent smoothness and low friction.Linear Guide Rail Set SFC20 1200mm: This set includes two 47.2" (1200mm) linear rails, four SC20 slide blocks, and four support brackets, making it suitable for larger automated machinery and CNC projects. With a dynamic load capacity of 882N per block and static load capacity of 1370N, it ensures long-lasting, smooth, and efficient operation.Key Differences:Guide Rail Length:SFC16 1000mm: 39.4" (1000mm).SFC20 1000mm: 39.4" (1000mm).SFC20 1200mm: 47.2" (1200mm).Model:SFC16 1000mm: SFC16 rails with SC16 slide blocks.SFC20 1000mm: SFC20 rails with SC20 slide blocks.SFC20 1200mm: SFC20 rails with SC20 slide blocks.Load Capacity:SFC16 1000mm: Dynamic Load: 774N, Static Load: 1180N per block.SFC20 1000mm: Dynamic Load: 882N, Static Load: 1370N per block.SFC20 1200mm: Dynamic Load: 882N, Static Load: 1370N per block.Shaft Diameter:SFC16 1000mm: Φ16 mm.SFC20 1000mm: Φ20 mm.SFC20 1200mm: Φ20 mm.Specifications:SFC16 1000mm:Model Number: SFC16-1000LGuide Rail Length: 39.4 in / 1000 mmShaft Diameter: Φ16 mmDynamic Load (per block): 774 NStatic Load (per block): 1180 NMaterial: High Carbon Steel & AluminumMounting Hole Distance A & B: 1.4 in / 36 mmSlide Block Size: 1.7 x 2 x 1.5 in / 44 x 50 x 38.5 mmProduct Dimensions: 39.4 x 3.8 x 1.7 in / 1000 x 96 x 44 mmNet Weight: 11.2 lbs / 5.1 kgSFC20 1000mm:Model Number: SFC20-1000LGuide Rail Length: 39.4 in / 1000 mmShaft Diameter: Φ20 mmDynamic Load (per block): 882 NStatic Load (per block): 1370 NMaterial: High Carbon Steel & AluminumMounting Hole Distance A & B: 1.6 in / 40 mmSlide Block Size: 2 x 2.1 x 1.6 in / 50 x 54 x 41 mmProduct Dimensions: 39.4 x 4.7 x 2 in / 1000 x 120 x 51 mmNet Weight: 7.3 lbs / 3.3 kgSFC20 1200mm:Model Number: SFC20-1200LGuide Rail Length: 47.2 in / 1200 mmShaft Diameter: Φ20 mmDynamic Load (per block): 882 NStatic Load (per block): 1370 NMaterial: High Carbon Steel & AluminumMounting Hole Distance A & B: 1.6 in / 40 mmSlide Block Size: 2 x 2.1 x 1.6 in / 50 x 54 x 41 mmProduct Dimensions: 47.2 x 4.7 x 2 in / 1200 x 120 x 51 mmNet Weight: 15.7 lbs / 7.1 kgPackage Contents:SFC16 1000mm:2 x SFC16 1000mm Linear Shaft4 x SC16 Sliding Blocks4 x Rail SupportsSFC20 1000mm:2 x SFC20 1000mm Linear Shaft4 x SC20 Sliding Blocks4 x Rail SupportsSFC20 1200mm:2 x SFC20 1200mm Linear Shaft4 x SC20 Sliding Blocks4 x Rail Supports