Sliding window carriage with plastic roller and brass axle suits AMP MK7. For bearing roller alternative see also Rollerco part 4-159. 
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AMP
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* Section 1 - Door Roller Assemblies
Suits older Dowell & Australian Metal Products (AMP) MK5B aluminium sliding doors with nylon roller. Replacement roller is 2-2151
* Section 2 - Rollers
36mm premium glass filled nylon tyre & stainless steel bearing with 6.4mm axle suits Dowell doors fitted with 1-1190.
* Section 4 - Window Rollers
Sliding window carriage & roller suits Stegbar. Can also use Rollerco part 4-1170.
* Section 5 - Window Catches, Locks & Fittings
Key lockable sliding window catch suits Dowell / Aust. Metal Products (AMP) MK7 sliding windows. This item will replace 5-1040 & 5-1410.
* Section 4 - Window Rollers
Sliding window carriage with 3 stage adjustable nylon bearing roller suits Capral 570 series, Alcan & G James school suite windows. For alternatives, see Rollerco parts 4-1310 and 4-1550.
* Section 4 - Window Rollers
Sash roller carriage with stainless steel wheel suits Cowdroy MKII sashless windows.
* Section 4 - Window Rollers
Window carriage & roller suits Showcase, Rylock, Lidco and other sliding windows.
* Section 1 - Door Roller Assemblies
Suits older Dowell & Australian Metal Products (AMP) MK5B ASD with 32mm nylon roller.