What size drill bit is required to install these?

you need 10mm for wood drill (even if they say 9mm), depth 13/14mm. To put the ferrule you need Allen key probably 6.5mm (much bigger than the allen key provided)

What length is the barrel on these sash stops? i.e. the brass barrel that protrudes once fitted.

It protrudes 20mm and have a diameter of 15mm. It is screwed into the fitting in the window using an Allen key

How are these installed? Will they fit into a plastic frame?

Not suitable for plastic frames.

I drill the hole in the frame, then how do i screw it in? Or do i hammer the screw in?

If I recall correctly you screw in the treaded receiver using an suitable Allan key that slots into it.

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🔒 Lock in safety and style—because your home deserves both.

COMPLETE SECURITY KIT - Includes key, screws, and socket for a seamless, all-in-one solution.
DURABLE LIGHTWEIGHT - Crafted for long-lasting performance at just 146g, blending strength with subtlety.
EFFORTLESS INSTALLATION - Hex key locking mechanism ensures quick, hassle-free setup without professional help.
UNCOMPROMISING CHILD SAFETY - Secure your home with a trusted solid brass restrictor designed to keep little ones safe.
SLEEK POLISHED BRASS ELEGANCE - Add a touch of timeless sophistication that complements any window style.

The Fulton & Bray FB319 Sash Window Stop Restrictor is a polished brass, solid brass safety device designed to enhance child safety and window security. It features a hex key locking mechanism for easy installation and comes complete with a key, screws, and socket. Lightweight at 146g, it combines durability with elegant design, making it a must-have for secure, stylish homes.

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Manufacturer	Fulton & Bray
Part Number	FB319
Package Dimensions	14.6 x 10.6 x 1.5 cm; 146 g
Manufacturer reference	FB319
Finish	Polished
Material	Brass
Power Source	Corded Electric
Installation method	Window
Plug profile	Window
Included Components	Key, Screws, Socket
Batteries included?	No
Batteries Required?	No
Item Weight	146 g

Fulton & Bray FB319 Sash Window Stop Restrictor for Child Safety and Security - Comes With Key Included (Polished Brass)

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