Putty brush

This ready-to-use round natural fiber brush makes it easy to force the stained glass putty under the lead came. Brush is 10 cm (4 in) diameter, handle is approximately 15.5 cm (6 in) long.

“… (T)he brushes are worth their weight in gold… A tool that makes the cementing process easier and cleaner. I was gonna say fun but that might be stretching it.”
Thomas McCorkell, Glasshaus Studio, IE