Features: 100% brand new and high quality long type square flange linear bearings of LMK8UU/ LMK12UU/ LMK12LUU optional size. Order Example : If your shaft diameter is 12mm, then you select LMK12LUU, other size likewise Industrial grade, Little backlash, run very smoothly Widely used for 3D printer part CNC parts, , Automation parts High accuracy G6 tolerance, Hardness HRC60-64, Roughness less than Ra0.8, Srtaightness: 50m/300mm Package Includes: 2 Pcs x Square Flange Linear Bearings Specifications: Item Name: Long Type Square Flange Linear Bearing Size: approx 1.5x1.5x2.4cm/0.59x0.59x0.94in (8UU) 2.1x2.1x3cm/0.83x0.83x1.18in( 12UU ) 2.1x2.1x5.7cm/0.83x0.83x2.24in ( 12LUU ) Type:LMK8UU/ LMK12UU/ LMK12LUU Material: Bearing Steel Quantity: 2PCS note: There might be little error of size for manual measurement. The colors deviation might differ due to different monitor settings, please kindly understand.