This perfect combination is very suitable for 4 inches (about 10.2 cm) ID ports on machines such as tape sawing, table saw, large plans, etc. Please note: If you are connected to the outer portion of the 4 -inch (about 10.6 cm), a elastic cuffs be required, such as 70149. cone reducer adopts ABS plastic structure, which can withstand the wear -related wear -stainless steel hose leakage and of the commonly collected by carpenter and dust 4 inches (about 10.2 cm) Named outer diameter size 3-61/64 inches (about 9.6 cm) outer diameter and 3-41/64 inches (about 8.1 cm) inner diameter; 2-1/2 inches inch(About 5.4 cm) The size of the rated outer diameter is 2-15/32 inches (about 5.4 cm) outer diameter and 2-9/32 inches (about 6.9 cm) Colour:As Shown Material:Stainless steel Package Contents: 1 set * 4 dust collection hose Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.