Colombo Design Isy BL11 RF/RYF – Slim Square Rose Door Lever
The Colombo Design Isy BL11 RF/RYF, designed by Luta Bettonica and Giancarlo Leone, is a brass interior door lever with a slim 50 × 50 mm square rose, 6.5 mm thick. The Six Millimeters Concept reduces the visible bulk of the mounting rose, emphasising the flowing geometry of the grip.
Design and slim rose
Isy brings together defined geometry and flowing lines. Its elongated, regular grip connects to the square rose through a smoothly curved transition, creating a sense of continuity and movement between the surfaces.
The design by Bettonica and Leone combines simple volumes with a dynamic form. The contrast between the square mounting base and the curved grip gives the handle a distinctive character suited to modern doors and contemporary interiors.
The BL11 RF/RYF configuration uses the low-profile roses and escutcheons of the Six Millimeters Concept. Compared with the standard Isy BL11 R/RY, it features a thinner rose and reduced overall projection.
Technical specifications
| Manufacturer | Colombo Design |
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| Collection / model | Contemporary – Isy |
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| Designers | Luta Bettonica and Giancarlo Leone |
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| Official product codes | BL11 RF / BL11 RYF |
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| Product type | Pair of interior door levers on slim square roses |
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| Material | Brass |
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| System | Six Millimeters Concept |
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| Lever length shown in drawing | 141 mm |
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| Projection shown in drawing | 63.5 mm |
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| Rose dimensions | 50 × 50 mm |
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| Rose thickness | 6.5 mm |
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| Escutcheon options | Patent keyhole (RF) / Euro-profile cylinder (RYF) |
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| Finishes | CR – Polished Chrome; CM – Matt Chrome |
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| Origin | Made in Italy |
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Finishes and coordinated hardware
The Isy BL11 RF/RYF is offered in Polished Chrome (CR) and Matt Chrome (CM). Both finishes highlight the geometric grip and its flowing transition to the square rose.
Coordinated fittings include the FF29 BZG bathroom privacy turn set, with a slim square rose, and the BL12 DKF/SM tilt-and-turn window handle, each offered in its respective catalogue configurations. The Isy BL11 R/RY standard-rose version is also offered as a separate product.
Ordering informationSelect the finish and Patent keyhole or Euro-profile cylinder configuration according to the installed lock. Check door preparation and compatibility with the slim-rose mounting system before ordering. Contact Matteoda customer service to confirm availability and estimated delivery times.
