Reynolds no. LS316 stainless steel water bottle boss 5x0.8 thread, 9mm head diameter, 6.39mm (1/4" drill) body diameter x 6mm length,open end type, pair. Note: Go to ATB006 to purchase stainless T25 Torx water bottle screws 5 x .8 x 10mm and to TAW025 for T25 Torx driver.