WIDEST RANGE OF APPLICABLE SCREW SIZES: Between 1.4~5.0mm(Incl,:1.4mm, 1.7mm, 2.0mm, 2.3mm, 2.6mm, 3.0mm, 3.5mm, 4.0mm, &5.0mm,) 9 sizes. MAX OF SCREWS LENGTH & HOPPER CAPACITY: Screw length: Up to 19mm (under scrw head) Capacity of hopper: 200~220 c.c APPLICABILITY OF SPECIAL SCRW TYPES: Screw length larger than Thread Diameter(1 bigger than 1) Thickness of screw head larger than 0.2mm No jamming or failure occurred with these applicable types and affect productivity. SIZE OF FEEDING RAIL IS ADJUSTABLE: Feeding rail can be pulled out for width adjusts to the applied sizes easily. Measurements for width adjusting can be in Metric or Imperial units. SAVE PARTS COSTS & STOCK; KFR-1050 allows adjusting the width of feeding rail to serve 11 sizes screw, between 1.4mm to 5.0mm diameter. The flexibility prevents dealers from stocking up on quantities for different sizes, and reduces the cost on related accessories for users. ADJUSTABLE VIBRATION INTENSITY: With vibration in small amplitude at high intensity, it moves screws On rail to pick-up point in good order, no overlay or jamming to Affect the speed of movement and productivity.