About these itemsFast cutting: Both circular saws, powered by high - speed brushless motors (4700 RPM and 5000 RPM respectively), offer efficient cutting performance, making numerous cuts per full charge.Adjustable angles: Capable of precise bevel cuts, with different cutting depths at 0° and 45° for various project requirements.Low - light operation: Built - in LEDs provide clear visibility in dark conditions, enhancing cutting accuracy.Durable build: High - hardness steel bases ensure stability and prevent breakage, while sharp, wear - resistant blades handle different materials.Good and easy operation: Metal blade guards block debris, dual - trigger designs prevent accidental startup, and ergonomic dual - handle designs offer comfortable grips.Key DifferencesThe circular saw with item model number MY - DS - 139 has a blade diameter of 6 - 1/2 in, a no - load speed of 4700 RPM, can make up to 110 cuts per full charge, has a cutting depth of 2.05 in at 0° and 1.57 in at 45°, a net weight of 8.49 lbs, and dimensions of 6.69 x 11.02 x 7.09 in. In contrast, the circular saw with item model number M0Y - DU49 - 185 has a blade diameter of 7 - 1/4 in, a no - load speed of 5000 RPM, can make up to 120 cuts per full charge, has a cutting depth of 2.56 in at 0° and 1.77 in at 45°, a net weight of 8.71 lbs, and dimensions of 14.57 x 5.91 x 10.43 in. Also, the first saw's package includes 2 screws while the second saw's package includes 1 screw.SpecificationsMY - DS - 139Item Model Number:MY - DS - 139Motor Type: BrushlessVoltage: DC 20VBlade Diameter: 6 - 1/2 inCharging Method: DCNo - Load Speed: 4700 RPMCutting Depth:0°: 2.05 in / 52 mm45°: 1.57 in / 40 mmNet Weight: 8.49 lbs / 3.85 kgDimensions: 6.69 x 11.02 x 7.09 in / 170 x 280 x 180 mmM0Y - DU49 - 185Item Model Number: M0Y - DU49 - 185Motor Type: BrushlessVoltage: DC 20VBlade Diameter: 7 - 1/4 inCharging Method: DCNo - Load Speed: 5000 RPMCutting Depth:0°: 2.56 in / 65 mm45°: 1.77 in / 45 mmNet Weight: 8.71 lbs / 3.95 kgDimensions: 14.57 x 5.91 x 10.43 in / 370 x 150 x 265 mmPackage Content MY - DS - 1391 x Circular Saw1 x Battery Pack1 x Charger1 x Blade1 x User Manual1 x Guide Rule1 x Hex Key1 x Vacuum Cleaner Adapter2 x ScrewsM0Y - DU49 - 1851 x Circular Saw1 x Battery Pack1 x Charger1 x Blade1 x User Manual1 x Guide Rule1 x Hex Key1 x Vacuum Cleaner Adapter1 x Screw