Secure Sash Stops (Pack of 4)Secure Sash Stops are an essential part of any sash window installation. They prevent the sash from being opened too far, ensuring a tidy finish and preventing possible damage to your property. The From the Anvil Secure Sash Stops are available in a choice of finishes and supplied as a set of four. They can be used with both original wood and uPVC sash windows to create a uniform finish throughout the property. Each stop features a discreet fixing