Alexander And Wilks Brunel Diamond Knurled Knob Small 20mm Satin Brass Pvd AW800-20-SBPVD 
Shop Anti-Ligature Knob—designed for safety in mental health and secure facilities. Tamper-resistant, smooth design reduces ligature risks and enhances security.
Anti Ligature knob
Zoo Hardware ZS-AL010-010 Anti Ligature knob on Rose – Int & Ext – Satin St Steel
£67.60