Rarely will the "cheapest" price be the best you in the long term. When comparing "like with like" please also take into comparison how long the company has been established and also the "quality" of their guarantees.
http://sliceroll35.bravesites.com/entries/general/various-features-of-vinyl-windows - evidently this is often used for doors, possibilities some companies that use this type of lock at replacement windows as well. It allows the person to look at the window partially when they want get a peek outside.
The DP Rating associated with a window can have several variables and as a way not to obtain confusing intends keep it simple over here. Basically, the DP test is to measure the strength of this capsule against hurricane force winds and water penetration on sides to a window. We prefer a DP rating of 50 or higher, but specific cases a DP-35 can do well as long as of the question is AAMA Gold Label Certified. Or even cases vegetables and fruit not the particular window whether it does not have access to the gold label.
Check to discover how your window operates. Slide aluminium windows and doors sevenoaks up and down. Adjust