For frost free sillcock. Measurement listed refers to the length of the stem that is behind the wall. The overall length of the stem is roughly 4 in longer. Suggestion for accuracy:measuring the overall length from end to end of the stem and then subtracting 4 in to get the length needed for replacement. No. 888-562: Type: Frost Free, Size: 8", Material: Brass, For Use With: SKU 480762, Pkg Qty: 1 No. 888-563: Type: Frost Free, Size: 10", Material: Brass, For Use With: SKU 480770, Pkg Qty: 1 Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!