Is 1/4" tube as od (outside diameter)?

Yes, ¼" is the outside diameter.

Are the rollers smooth? Would soft metal, like brass, be marked by rollers?

Hi, thanks for your inquiry. The roller surface is knurled as the picture showing. Probably there will be pressing mark in soft metal.

Can you set it for a specific diameter and just roll it or is it just trial and error

The diameter of the bend you make is going to depend on the length of your stock. There is no diameter setting. Make your bends in quarter turn increments, roll and repeat. This machine is mainly for rings. If you’re trying to make decorative bends that can be achieved but not exactly what it’s for. Hope that helps.

Can it roll 1 inch copper tubing

I don't believe so, there is not a groove to ride in for 1" material, may flatten it

Manual Ring Roller 1 4 In Round Steel Kaka Industrial

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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$374.90

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Bend brilliance into every curve—master metalwork with precision and power!

COMPACT PORTABLE - Lightweight 15-lb design with a 12.5-inch hand crank for seamless bench-top or mobile use anywhere.
HEAT TREATED DURABILITY - Thermally hardened rollers ensure long-lasting wear resistance for relentless metal shaping.
PRECISION CIRCLE FORMING - Craft flawless 3-inch+ rings with unmatched circularity—perfect for standout chandeliers and plant holders.
INDUSTRIAL GRADE CAPACITY - Effortlessly bend 1/4 inch round and 1x3/16 inch flat steel bars without slippage or deformation.
TRUSTED FOR CUSTOM FABRICATION - Engineered for artistic ironwork, repairs, and bespoke metal projects—join the pros who rely on PR-3.

The KAKA INDUSTRIAL PR-3 Manual Ring Roll Bender delivers precision bending for 3-inch minimum diameter rings using a hand-powered crank. Designed to handle 1/4 inch round bars and 1x3/16 inch flat bars, its heat-treated rollers provide exceptional durability. Compact and portable at just 15 lbs, it’s ideal for custom metal fabrication, artistic ironwork, and repair workshops seeking reliable, professional-grade performance.

Specifications

ASIN	B015KDO5S4
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#238,295 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #293 in Rebar Cutters & Benders
Color	Grey
Customer Reviews	4.4 4.4 out of 5 stars (221)
Date First Available	September 19, 2015
Included Components	body
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	13.67 pounds
Item model number	PR-3
Manufacturer	KAKA INDUSTRIAL LLC
Part Number	PR-3 Manual Ring Roller
Power Source	hand_powered
Product Dimensions	14.17 x 7.87 x 8.27 inches
Style	PR-3

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