In terms of measuring your glass there are two choices for you. Our software can calculate the position of your posts and the width of the glass panels. It is preferable however if you install your stainless steel posts with a handrail first and then come back and confirm your final glass measurements. You can then position your stainless steel posts with a handrail exactly where you want them. To calculate the width of your glass panels, you simply measure from the inside of post to inside of post and deduct 40mm. This is calculated on the basis that distance from the outside edge of the glass to the inside edge of the post on either side is 20mm. The height of the glass panel is usually calculated to be 898mm leaving the same gap from the top of the glass to the top of the handrail as from the bottom of the glass to the ground.