Your search for "Diagonal box" revealed the following:

Diagonal crossing (large) : YSK Unpainted kit N (1:150) Part No. 409

Diagonal Crossing (small) : YSK Unpainted kit N (1:150) Part No. 408

Diorama Hyotan - Emerald Valley : Hyotan Sumijiro - diorama art work non-scale

Scene Box "Fascinating Finger Picking" : JOUKEIBAKO Pre-painted 1:64

Town factory C : Sankei kit N (1:150) MP03-106

Accessory Set D : Aurora Model Unpainted Kit O (1:48) Kt-014

Kunekune Rail for Mini Mini Train Compatible with Daiso Case 20x10cm : Yoshiaki Ishikawa Railroad Track 9mm Gauge N(1:150)

Rail R40 Oval for Mini Mini Train Compatible with Daiso Case (20 x 10cm) : Yoshiaki Ishikawa Railroad Track 9mm Gauge N(1:150)

Honey basket with 3 cars : Yoshiaki Nishimura HO layout section diorama work 1:80scale

Freight Train Home with Tokyu Freight Train 3041 : Yoshiaki Nishimura HO layout section diorama work 1:80scale

Atsugi Airfield : Yoshiaki Nishimura HO layout section diorama work 1:80scale

Hexagon Socket Head Fittings, Double Dia. 1.8mm Flat, Tapered : Sakatsu Detail Up Non-scale 4458

Hexagon bolt: nut 1.0mm flat diameter : Sakatsuo Detail up Non-scale 4501

Hexagonal pipe joint, double flat 1.5mm : Sakatsu Detail Up Non-scale 4452

Hexagon bolt 0.9mm flat diameter : Sakatsu Detail up Non-scale 4495

Hexagon bolt: Nut 0.9mm flat diameter : Sakatsu Detail up Non-scale 4496

Hexagon joint, flat 1.5mm: Sakatsu, detail up, non-scale 4453

Hexagon Socket Head Fittings Double 1.5mm dia. with Taper : Sakatsu Detail Up Non-scale 4460

Hexagon socket head fitting, flat 1.2mm : Sakatsu Detail Up Non-scale 4455

Hexagon joint, flat diameter 0.6mm (for 0.25mm wire) : Sakatsuu Detail Up Non-scale 4470